Add initial GitHub Actions CI configuration.

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: CI
+
+on: pull_request
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    env:
+        SPARK_LOCAL_IP: localhost
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+      - uses: actions/cache@v2
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
+      - run: mvn --batch-mode --update-snapshots clean package

.github/workflows/deploy.yml

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+name: Deploy Snapshot
+
+on:
+  push:
+    branches:
+    - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'bigdatagenomics/adam' }}
+    env:
+      SPARK_LOCAL_IP: localhost
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+          server-id: sonatype-nexus-snapshots
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_PASSWORD
+      - env:
+          MAVEN_USERNAME: ${{ secrets.OSS_SONATYPE_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSS_SONATYPE_PASSWORD }}
+        run: mvn --batch-mode -DskipTests=true deploy